Stockholders' Deficit - Schedule of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (2,642,000,000)	$ (1,464,000,000)	$ (1,599,000,000)	$ (1,490,000,000)
Other comprehensive income (loss) before reclassifications	(147,000,000)	76,000,000	(155,000,000)	95,000,000
Amounts reclassified to earnings and other	48,000,000	(1,000,000)	47,000,000	(2,000,000)
Other comprehensive income (loss), net of tax	(99,000,000)	75,000,000	(108,000,000)	93,000,000
Ending balance	(2,704,000,000)	(1,682,000,000)	(2,704,000,000)	(1,682,000,000)
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax	0	0	0	0
Derivatives designated for hedge accounting | Net Investment Hedging | Currency swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), net investment hedge, gain (loss)	106,000,000	(27,000,000)	93,000,000	(20,000,000)
Derivatives designated for hedge accounting | Cash Flow Hedges | Currency swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax	16,000,000	9,000,000	2,000,000	36,000,000
Derivatives designated for hedge accounting | Cash Flow Hedges | Foreign currency forwards
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax	(1,000,000)	(1,000,000)	1,000,000	(1,000,000)
Total Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(890,000,000)	(887,000,000)	(881,000,000)	(905,000,000)
Ending balance	(989,000,000)	(812,000,000)	(989,000,000)	(812,000,000)
Foreign Currency Translation Adjustments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(843,000,000)	(864,000,000)	(856,000,000)	(847,000,000)
Other comprehensive income (loss) before reclassifications	(239,000,000)	92,000,000	(226,000,000)	75,000,000
Amounts reclassified to earnings and other	48,000,000	0	48,000,000	0
Other comprehensive income (loss), net of tax	(191,000,000)	92,000,000	(178,000,000)	75,000,000
Ending balance	(1,034,000,000)	(772,000,000)	(1,034,000,000)	(772,000,000)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(22,000,000)	(9,000,000)	(12,000,000)	(14,000,000)
Other comprehensive income (loss) before reclassifications	79,000,000	(20,000,000)	69,000,000	(15,000,000)
Amounts reclassified to earnings and other	0	0	0	0
Other comprehensive income (loss), net of tax	79,000,000	(20,000,000)	69,000,000	(15,000,000)
Ending balance	57,000,000	(29,000,000)	57,000,000	(29,000,000)
Other comprehensive income (loss) before reclassification, tax	27,000,000	(7,000,000)	24,000,000	(5,000,000)
Unrealized Gains (Losses) on Cash Flow and Other Hedges, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,000,000)	(4,000,000)	3,000,000	(36,000,000)
Other comprehensive income (loss) before reclassifications	11,000,000	5,000,000	2,000,000	37,000,000
Amounts reclassified to earnings and other	0	0	0	0
Other comprehensive income (loss), net of tax	11,000,000	5,000,000	2,000,000	37,000,000
Ending balance	5,000,000	1,000,000	5,000,000	1,000,000
Other comprehensive income (loss) before reclassification, tax	4,000,000		1,000,000
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(19,000,000)	(10,000,000)	(16,000,000)	(8,000,000)
Other comprehensive income (loss) before reclassifications	2,000,000	(1,000,000)	0	(2,000,000)
Amounts reclassified to earnings and other	0	(1,000,000)	(1,000,000)	(2,000,000)
Other comprehensive income (loss), net of tax	2,000,000	(2,000,000)	(1,000,000)	(4,000,000)
Ending balance	$ (17,000,000)	$ (12,000,000)	$ (17,000,000)	$ (12,000,000)